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2D MHD and 1D HD Models of a Solar Flare—a Comprehensive Comparison of the Results
Srivastava, A. K.; Murawski, K.; Falewicz, R. +1 more
Without any doubt, solar flaring loops possess a multithread internal structure that is poorly resolved, and there are no means to observe heating episodes and thermodynamic evolution of the individual threads. These limitations cause fundamental problems in numerical modeling of flaring loops, such as selection of a structure and a number of thre…
Formation of a quasi-one-dimensional current sheet in the laboratory experiment and in the Earth's magnetotail
Petrukovich, A. A.; Artemyev, A. V.; Vasko, I. Y. +2 more
Two-dimensional current sheets (CSs) generated in the CS-3D laboratory device are considered. Results obtained in the laboratory experiment are compared with spacecraft observations of CSs in the Earth's magnetotail. The longitudinal and transverse CS structures, as well as CS evolution during the thinning process are studied. It is demonstrated t…
Variability of the soft X-ray excess in IRAS 13224-3809
Papadakis, I. E.; Kammoun, E. S.; Sabra, B. M.
We study the soft excess variability of the narrow line Seyfert 1 galaxy IRAS 13224-3809. We considered all five archival XMM-Newton observations, and we applied the flux-flux plot (FFP) method. We found that the FFPs were highly affected by the choice of the light curves' time bin size, most probably because of the fast and large amplitude variat…
Identifying AGN Balmer absorptions and stratified narrow emission-line region kinematics in SDSS J112611.63+425246.4
Wang, J.; Xu, D. W.
Context. Balmer absorption is a rare phenomenon in active galactic nuclei (AGNs). So far, only seven Balmer-absorption AGNs have been reported in the literature.
Aims: We here report the identification of SDSS J112611.63+425246 as a new Balmer-absorption AGN through our spectral analysis and study the kinematics of its narrow emission-line re…
Estimation of inflation parameters for Perturbed Power Law model using recent CMB measurements
Das, Santanu; Souradeep, Tarun; Mukherjee, Suvodip +1 more
Cosmic Microwave Background (CMB) is an important probe for understanding the inflationary era of the Universe. We consider the Perturbed Power Law (PPL) model of inflation which is a soft deviation from Power Law (PL) inflationary model. This model captures the effect of higher order derivative of Hubble parameter during inflation, which in turn …
Binary Astrometric Microlensing with Gaia
Sajadian, Sedighe
We investigate whether or not Gaia can specify the binary fractions of massive stellar populations in the Galactic disk through astrometric microlensing. Furthermore, we study whether or not some information about their mass distributions can be inferred via this method. In this regard, we simulate the binary astrometric microlensing events due to…
Quantifying Dark Gas
Heiles, Carl; Li, Di; Xu, Duo +2 more
A growing body of evidence has been supporting the existence of so-called "dark molecular gas" (DMG), which is invisible in the most common tracer of molecular gas, i.e., CO rotational emission. DMG is believed to be the main gas component of the intermediate extinction region between A$\rm_v$$\sim$0.05-2, roughly corresponding to the self-shieldi…
Suzaku Observation of the Fermi Cygnus Cocoon: The Search for a Signature of Young Cosmic-Ray Electrons
Mizuno, T.; Takahashi, H.; Tibaldo, L. +4 more
The origin of Galactic cosmic rays remains unconfirmed, but promising candidates for their sources are found in star-forming regions. We report a series of X-ray observations, with Suzaku, toward the nearby star-forming region of Cygnus X. They aim at comparing diffuse X-ray emissions on and off the γ-ray cocoon of hard cosmic rays revealed by the…
Chromospheric Rapid Blueshifted Excursions Observed with IBIS and their Association with Photospheric Magnetic Field Evolution
Liu, Chang; Jing, Ju; Denker, Carsten +9 more
Chromospheric rapid blueshifted excursions (RBEs) are suggested to be the disk counterparts of type II spicules at the limb and believed to contribute to the coronal heating process. Previous identification of RBEs was mainly based on feature detection using Dopplergrams. In this paper, we study RBEs on 2011 October 21 in a very quiet region at th…
SMART-1 end of life shallow regolith impact simulations
Foing, B.; Burchell, M. J.; Cole, M. J. +3 more
The SMART-1 end-of-life impact with the lunar surface was simulated with impacts in a two stage light-gas gun onto inclined basalt targets with a shallow surface layer of sand. This simulated the probable impact site, where a loose regolith will have overlaid a well consolidated basaltic layer of rock. The impact angles used were at 5° and 10° fro…